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(B) The partial pressures of respiratory gases at different sites are as follows:$1$. Alveoli: $PO_2 = 104 \ mmHg$ and $PCO_2 = 40 \ mmHg$.$2$. Deoxyg

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$A-iii, B-iv, C-i, D-ii$

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(B) The partial pressures of respiratory gases at different sites are as follows:$1$. Alveoli: $PO_2 = 104 \ mmHg$ and $PCO_2 = 40 \ mmHg$.$2$. Deoxygenated blood: $PO_2 = 40 \ mmHg$ and $PCO_2 = 45 \ mmHg$.$3$. Atmospheric air: $PO_2 = 159 \ mmHg$ and $PCO_2 = 0.3 \ mmHg$.$4$. Tissue: $PO_2 = 40 \ mmHg$ and $PCO_2 = 45 \ mmHg$.Matching the given values:- $A$ (Alveoli) matches with $iii$ $(104 \ mmHg \ PO_2)$.- $B$ (Deoxygenated blood) matches with $iv$ $(40 \ mmHg \ PO_2)$.- $C$ (Atmospheric air) matches with $i$ $(0.3 \ mmHg \ PCO_2)$.- $D$ (Tissue) matches with $ii$ $(45 \ mmHg \ PCO_2)$.Therefore,the correct match is $A-iii, B-iv, C-i, D-ii$.

Column-$I$	Column-$II$
$A$. Alveoli	$i$. $0.3 \ mmHg \ PCO_2$
$B$. Deoxygenated blood	$ii$. $45 \ mmHg \ PCO_2$
$C$. Atmospheric air	$iii$. $104 \ mmHg \ PO_2$
$D$. Tissue	$iv$. $40 \ mmHg \ PO_2$

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